--- a/acinclude.m4
+++ b/acinclude.m4
@@ -892,6 +892,8 @@ case $PLATFORM in
         case "x`uname -r`" in
 changequote(, )dnl
             x2.[23456789]* ) ;;
+changequote(, )dnl
+            x3.* ) ;;
 changequote([, ])
             * ) braindead=yes ;;
         esac
